振動壁を有する二次元チャンネル内の乱流特性

实验测量了二维振荡壁面通道内流动的压力分布、速度分布和湍流度。在本研究中，实验在过渡流区附近进行。实验结果总结如下：(1)压力：a。压力分布的稳定分量受到频率在30hz附近的振荡壁面的强烈扭曲。这种效应随着雷诺数的增加而减弱。(2)速度和湍流强度：a。壁面的振荡使平均速度的轴向分量变平，湍流强度增大，壁面振荡频率的增加和雷诺数的减小加剧了壁面振荡效应引起的功率谱畸变。此外，在400Hz以下的低频区域，功率谱的畸变明显。

The pressure distributions, velocity distributions and turbulence intesities of the flow through a two-dimensional channel with oscillating wall were measured experimentally. In this study, the experiments were performed in vicinity of the transitional flow region. The experimental results are summarized as follows.(1) pressure :a.The steady components of pressure distribution are distorted strongly by the oscillating wall whose frequency lies in vicinity of 30Hz.b.This effect becomes weak with the increase in Reynolds number.(2) velocity and turbulent intensity :a.The oscillation of wall has an effect to flatten the axial component of avedaged velocities and to increase the turbulence intensity.b.The increase in the wall oscillating frequency and the decrease in the Reynolds number strengthen the distortion of power spectrum due to the wall oscillating effect. Moreover, the distortion of power spectrum is clearly noticed in the low frequency region below 400Hz.